harding



2 Sheets-Sheet 2.

(No Model.)

T. HARDING.

TUBULAR SEGTIONAL' BOILER. No. 258,415. I Patented May 23, 1882.

JEN/T0455. Inventor: gym Q/w UNITED STATES PATENT OFFICE.

THOMAS HARDING, OF LAFAYETTE, INDIANA, ASSIGNOR OF TWO-THIBDS TO WILLIAM T. BARBEE AND CHAS. B. SIMPSON, BOTH OF SAME PLACE.

TUBULAR SECTIONAL BOILER.

SPECIFICATION forming part of Letters Patent No. 258,415, dated May 23, 1882.

Application filed October 1, 1861.

To all whom it may concern:

Be it known that I, THOMAS HARDING, of Lafayette, in the county of Tippecanoe and State of Indiana, have invented a new and useful Improvement in Tubular Sectional Boilers for Steam-Generators; and I do hereby declare that the following is a full and accurate description of the same.

I am aware that tubular boilers have been made in sections and held together by bolts heretofore, and therefore I do not claim a boiler so constructed, broadly, but intend to confine my claims to the particular methods of construction shown and hereinafter described, having reference to the accompanying drawings, wherein Figure 1 is a front elevation of my boiler. Fig. 2 is a rear elevation of the same. Fig. 3 is a plan. Fig. 4 is a transverse section of the hollow ring. Fig. 5 is a horizontal section near the base.

The boiler is composed of a series of cylindrical tubes, A, set close together upon and in internal communication with ahollow basering or annulus, B, and jointed at top by a similar hollow ring or annulus, O, with which said tubes are also in internal communication. The ring B constitutes the frame for the grate D, which fills its central space, and the lower portions of the tubes constitute the fuel or fire basket. The spaces between the tubes, for a short distance up from the base-ring B, are

closed by pieces of cast-iron E, the opposite sides whereof are made concave, so as to fill the spaces between the tubes. These pieces E prevent the escape of the fuel, while above them there is space for the escape of flame and hot products of combustion, so as to expose a-ll sides of the tubes to the flames, and thereby secure uniform expansion. This tubular structure is bound together by tie-bolts F, which pass down through the rings B G and (N 0 model.)

like rings B 0, thereby leaving a door-opening in the side. The whole is inclosed in a jacket, J, which is provided at the top with ahood or cover and an mtlet or stack for the escape of the products of combustion. A door, K, is hung to the casing opposite the dooropening above described.

Feed-water is introduced to the lower or base ring, 0, any suitable forcing apparatus being provided.

The mode of seating the tubes on the base and cap ring is by a groove, 9, sunken into the face of the base or cap ring and annular as to the opening corresponding to the tube. Into this groove the end of the tube is fitted and seated on a gasket of lead or other suitable material placed in the bottom of said groove. When all the parts are forced together by the tie-bolts said gaskets make the joints watertight. In this wayI construct a circular tubular boiler in which the tubes themselves constitute the shell and frame inclosing the firechamber. The whole stands upon a suitable base, which also constitutes the ash-pit.

Having described my invention, what I claim as new is 1. A tubular boiler constructed with a hollow annulus-ring at bottom and a similar ring at top, joined together by a consecutive series of vertical tubes set in a circular line, whereby said annuli and tubes constitute both the shell and frame of water-jacket, fire-chamber, and steam-generator, and the products of combustion pass freely out at the top, as set forth.

2. The hollow annuli B and O and their connecting-tubes set close together to inclose the grate, combined with the pieces E, fashioned to fit and be retained in place between and by the tubes, as set forth, whereby the lower part of the boiler is caused to constitute a close fire-box, and the jacket J surrounding and inclosing the whole, as set forth.

3. The hollow annuli and their connectingtubes arranged in a circular line close together to form the shell and frame of a boiler, combined with a hollow arched bridge-piece, G, substantially as described.

THOMAS HARDING.

Witnesses JAMES T. DAVIDSON, W. T. BARBEE, R. P. DAVIDSON. 

